Those are the adresses of the Internet. When devices communicate with eachother, they say sth. like “no. 369, here is the current weather forecast”.
IPV4 and IPV6 define the length of the adress and therefore the maximum of users at the same time.
IPV4 is widely spread and running out of adresses, that is why IPV6 is comming: longer adresses for more users.
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